How much money should I have for a month on tour?

Well i'm going on two tours next year in January the 03 Jan European Discovery (Winter) tour and the 17 Jan Austria Ski Plus (coach from London) - 1 week tour
and i'm not sure how much money i should have saved, I'll have to account for booze, food, snowboarding gear and lift passes (I think) and whatever else I'll need.

If anyone that has been on these tours can help that would be awesome :D
Aussy dollars btw